$305.1 billion (2017)
How they do it: Royal Dutch Shell gas stations began selling items unrelated to petrol already in the 1930s. For instance, food and beverages, magazines, household goods etc. This leveraged the network of existing infrastructure to cross-sell a wide array of various products to the same customer base.
How they do it: Shell started a loyalty program for its customers called Fuel Rewards®. Members earn 5¢/gallon for every $25 spent inside participating Shell stations.
How they do it: In the United States, Shell has a network of strategically-located local service stations, offering convenience retailing as well as a variety of fuel products. Shell offers franchise opportunities for suitable candidates. Successful applicants are required to have at least 10 percent unencumbered cash of the total capital required for investment.